Tektronix FG501 User manual

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070-1431-01
Te
k tro nb
c
CO M M ITT E D TO E XC
E LLE N C E
FUNCTION
GENERATOR
1
INSTRUCTION
M ANUAL
Te k
tro n i x , Inc .
Ρ .
Ο . Box
500
B eaverto n , Orego n
97077

Serial N u m
ber
F irst p ri n ti ng
A ug u st Ι 972

nearest Tektron
timber
r
is warranted against detecfit "c meAc' - iw .i and
rmal use,
for a
nix will repair or replace, at its op
termined to
be
defecUve
within the wana
ix Servicx? !^ ι
;υ
,
vvorkt
iniflal shipment,
produccis de
avd rv-
?
urnpd, freight
prepaid ., to
fitness wof I 01i Y

V%

k1i
Please direct
all requests for service or replacement parts to the
nter or Field Office, include the type or
product and its serial number .
Copyright -) 197 2 , 1978 by Tektronix .
reserved . Contents of this publication may not be
duced in any form without the permissio
ektronix, I
Products of Tektronix, inc . and its subsidiaries ar ; a
covered by U .S . and foreign patents and/or pending
patents .
TEKTRONIX, TEK, SCOPE-MOBILE, TELEQWPMENT,
and

are
registered
trademarks of Tektronix, Inc .
Printed
in U .S .A . Specification and price change
privNeges are reserved .

TABLE Ο F CO N T EN TS
S
E CTIO N 1
S
E CTIO N 2
W A RN ING ,
THE
FO LL
O
W I NG S ERV ICI N G I N ST RU CTIO N S AR EF OR U SE BY
Q
U
A L I F I E D PER-
SO
NNEL O NL Y . T O AV OID PER SO N A L I NJUR
Y,
DO NOT
PERFO RM ANY S ERV ICI N G
OT HER THAN THAT CO N TAI NE D IN OPER ATI NG
I N
ST
RU CTIO N S UNLE SS YO U A RE
QUA L I F I ED TO DO SO .
C HA N G E I NF O RM ATIO N
SE CTIO N 3 AD JUST
MEN T
3-1
SE CTIO N 4 M AI NT EN A N C
E AND I NT ERF ACI NG I NF O RM ATION 4-1
SE CTIO N 5 CI
R
CU
IT D E
SC
R I P TIO N
5-1
SE
CTIO N 6 O P TIO N S
6-1
SE CTIO N 7 REPL AC E A BLE ELE CT
R ICA L P A R TS 7-1
S E CTIO N 8 DIAG RA M A ND CI
R CU IT B
OA
RD I LLU ST R ATIO N 8-1
SE CTIO
N9 REPL AC E A BLE ME CHAN ICA L P A R TS A
N D E X PL
OD
E D V IE W 9-1
,. P age
O PER ATI N G I N ST RU CTIO N S
1-1
S PE CI F ICATIO N AND PERF O RM
ANC E C HE C K 2-1

Fig . 1-1 . FG 501 Function
Generator

I N T
R OD U CTIO N
Th e F G 501 Function
Generator is designed to op erate
i nα TM 500-Series p ower mo d ule
.
L
ow d istortion si n e,
s q uare, triangle, pulse, an d ramp
waveformsfrom 0 .001 Hz
to 1 MH z as well as α +2,5 volt sq uare-wave
trigger are
available at t he front p an el . V ariable DC
offset of
±7
.5 volts
is also p rovide d . Α "h ol d " feature allows
t he ge n erator
outp
ut to be abru p tly h alted at its instantaneous
voltage
level an d h el d t here un
til ma n ually switc h ed on again .
Α voltage-controlle d fre q uency (V C F) in p
ut is provi d ed
to control t h e out p ut fre quency from
an exter
n
al voltage
source . T he outp ut fre quency can be swe p t above
or
below t h e selecte d fre q ue ncy to α maxim u m of 1000 :1
de pe nd ing on t he polarity and am p litu d e of t he V C F i n put
an d t h e selecte
d output frequency .
Also inclu d ed is
an exter n al gate in p ut t h at allows t he
generator to be
tur n ed on for t h e d uration of an externally
ap p lie d gating
signal . T h is mo d e p rovi des eit h er α
single
cycle outp ut or α train
(burst) of p reselected waveforms
dependi n g on t he gating sig
n al width an d t he ge n erator
fre q
uency setti n g . T he p h ase (start level)
of t he waveform
burst
can be varie d ±90° b yα fro n t- p an
el con trol .
T he variety
of swe p t a n d mo d ulate d signals
available
from t he F G 501 ma ke
it es p ecially usef u l for suc
h
ap p
lications as testing
servo-system or amplifier
res p onse, distortio n , and stability ;
FM ge n eratio n an d
fre q
uency multiplicatio n ; or sim p ly u
sed as α variable
beat-fre q ue ncy
oscillator, re p etitio n -rate,
o r tone-burst
ge n erator . T h e
sq uare-wave trigger outp ut
ca
n
be use d as
α source for tra n
sistor-tra n sistor logic (TT L ) or
to syn-
ch ro n ize an exter n al
device such as an oscilloscope
or
counter .
T h
e F G 501 is calibrated a nd ready for use w h en
received
. It is design ed to op erate in any compartment of α
TM 500-Series
power module only . R efer to t he p ower
mo d ule I n st r uctio n
Manual for line voltage re q ui r eme n ts
a nd power mo d ule operatio n .
REV . C JUL 197 8
OPERATING
I N
ST
RU CTIO N S
Installation an dR emoval
Sectio n 1- F G 501
Turn t he p ower mo d ule
off before inserting t h e plug-
in ; otherwise, d amage
may occu r to t h e plug-in
c
ί
rcuitry . B ecause of t h ehigh cu
r rent drawn by t he
FG 501, it is also r ecommen d
e d th at t he p owe r
mo
d ule be turned off before
removing t h e FG 501 .
R efer to
Fig . 1-2 . C h ec k to see th
at t he plastic
barriers on t h e
interconnecting jac k of t h e
selecte d
p ower module compa r
tment matc h th e cut-outs
in
t he F G 501 circuit board edge
connector .
Align t h e F G 501 ch assis wit h t he upper a nd
lower
guides of t h e selected com p artme n t . P ush t h e mo d ule in
a nd p ress firmly to seat t he circuit board in t he inter-
connecting j ac k .
Pull t he P ower switc h
on t h e fro n t p anel of t he p ower
module to apply p ower to t h e F G 501 .
Observe t
h
at t h e
P O WER indicator lig h t on t he F G 501 comes
on .
R emove t he F G 501 from t he power
mo d ule by p ulli ng
t he release latc h at t he bottom of t he fro n t pa n el a
nd
sliding
t he unit straig h t out of t he p ower module .
F ig . 1-2 . P l u g-i n i n stallatio na nd r emoval .

O p e
r ating I n st ru ctions-
F
G
501
O PER
ATI N G CON
SID ER ATIO N S
ΝΟΤΕ
Befo
r
e
using t h e FG 501
fo r t h e first
time, r ead t he
Operati n g Co n
siderations in t h is section
an d t he
d
esc r i p tion of t he f r
ont-panel controls,
connectors,
and
indicators i n F
ig . 1-3 .
Out p ut Con
n ections
T he
output of t he F G 501 is designed to operate
as α
voltage source in series
wit h 50 Ω and wor k i ng i n to
α50 Ω
load . At t h e
h
ig
h
er
f r e qu encies, an un te r mi n
ated or
im p roperly
termi n ated output will ca u se
excessive
a b erratio n s on t he outp ut waveform
(see Impe d ance
M atc hing disc u ssion) .
L
oa
d s less than 50 Ω will re d ucet he
waveform am p litude .
E xcessive
distortion or a b errations due
to imp r op er
terminatio n is less li k ely to occur at
t he lower fre q ue n cies
(especially wit h sine an d tria n gle waveforms)
. H oweve r , to
en sure t h at waveform pu r ity is
preserve d , observe t he
following precautio
ns :
1 . U se q
uality 50 Ω coaxial cables and
con n ectors .
2
.

M
a
k e all con n ectio n s tig h t a nd as s
h ort
as p
ossible .
3 . Use q
uality atte nu ators, if necessa
r y, to red u ce
waveform am p litude to
sensitive ci r cuits .
4 . U se termi n ators or
im p edance-matc h i n g
devices to
avoid reflectio n s w
h
e
n usi ng long ca b les, i .e .,
six feet or
more .
5 . E nsure t h at atte n uators,
termi n ations, etc . h ave
ad e qu ate power- h
andli ng capa b ilities for t he output
waveform (a pp
roximately 0 .5 W into α 50
Ω load) .
P ower o
u tput is determine d by t he selecte
d waveform,
its am
p litude, a nd t h e amou n t of
offset voltage selected .
T he p h ysical a nd electrical ch
aracteristics of t he pu lse-
tra n smitti n g cable d
etermi ne t h e ch aracteristic
im-
pedance, velocity of
prop agatio n , and amou n t of
sig n al
loss . Signal loss,
d ue to en ergy d issipatio n
i nth e ca b le
dielectric,
is p ro p o r tio n al to t h e fre q ue
n
cy ;
t h erefore, α
few feet
of ca b le can atte n uate h ig h -freque ncy
i n forma-
tio n in α
fEkst-rise p ulse . It is importantto
k
eept
h ese cables
as sh
ort as possible .
Wh en signal com
p arison measurements
or time
difference determinatio
ns are made, t h e
two signals from
t he test device s
h
o
u ld travel t h roug h
coaxial cables wit h
identical loss
and time-d elay c h
aracteristics .
If t here is α d o voltageacross
t h eoutput load, t h e
output
p ulse
am p litu d e will be
compressed ; or in some
cases, if
t he voltage excee d s
±10 V, it may sh ort t
heoutput . To
preven t t h is from
occurring, t h e output
must b e coupled
t h roug hα do
b loc king cap acitor to
t h e loa d . The time
con sta n t of
t he cou p li n g ca p acitor an d
loa d must be lo n g
eno ug h to
maintai n p ulse flat ness .
R isetime and Falltime
If t h e out p ut pulse
from t h e F G 501 is use
d for
measuri ng t he r ise or
falltime of α d evice, t
h e risetime
ch aracteristics of
associate d eq ui p me
n t may h ave to be
considered . If
t he risetime of t he device un
der test is at
least 10 times
greater t han t he combine
d risetimes of t he
F G 501 plus
t he monitoring oscilloscope
a nd associate d
cables,
t h e error i n troduced will
n
ot
exceed 1 ο/ο an d
generally
can be ignored . If t he rise
or falltime of t he test
device, h owever, is less
t han 10 times as long as
t he
combi ned risetimes of
t h e testi ng system,
t h e actual
risetime of t he device
will h ave to b e d
eterminedfrom t h e
risetime of
eac h compone n t ma k i ng up
t h e system . T h is
equals t he s q uare
root of t he sum of
t he sq uares of t h e
i n divi d ual
risetimes . Co n versely,t
herisetimeoft h edevice
under test can be found
from t h e same relations
h ip if all
t he actual risetimes in t
h e system are kn own except
t h at of
t he device under
test .
Im p edance
M atc h i ng
R eflectio n s . As α pu
lse travels d own α tra
nsmission
line, eac h time it encou
n ters α mismatc
h ,
or an im p
eda n ce
differe n t t han t
he transmission li
n e, α r eflection is
generate da
nd sent backalon g t he
line to t he source . T he
amplitude
and p olarity of t he reflectio
ns are d etermi
n
ed
b y t he
amount of t h e encountere
d impedance i n
relatio n
to t he ch
aracteristic im p
edance of t he ca b le .
If t he
mismatc
h im p edance is h ig h er t
han t h e line, t h e
reflectio n
will be of
t h e same p olarity as
t h e applied sig
n al ; if it is
lower, t h e reflection
will b e of o p posite p ola r ity .
If t h e
reflecte d signal retur ns before
t h e pulse is en d ed,
it ad ds
to or
subtracts from
t h e am p lit u de of t
hepulse . Th is
distorts t he p
ulse s h ape a nd
amplitude .
M atc h ing N etwor ks . T
he following d escribes
met h ods
for
matc h ing impedance
networ k s i n to
relatively
low
impedances . If t h e F G
501 is d rivi ng α h ig
h impe d ance,
suc h as t he 1 ΜΩ
i np ut impedance of t
h
e
vertical inpu t for
an oscilloscope,
t h e transmissio n line
must be termi n ate d
REV . Β JUL 197 8

Selects sine, triangle,
square, ramp, and pulse
output waveforms . Pulse
and ramp waveform
duration is 1/2f . See
Operating
Con-
siderations for addi-
tional information .
Concentric with OFF-
SET control . Varies am-
plitude
of waveform at
the OUTPUT connector
from less than 500 mV
(fully ccw) to 20 V p-p
open circuit ( S N
B130000-up) . For SN
below 8130000, con-
trol
is label OUTPUT and
provides a maximum
of
15 V p-p open
circuit .
REV C,
MAR 197 9
FUNCTION Selector
AMPL Control
OFFSET Control
Concentric with AMPL
contrN . For S N
13130000-up,
control
pullout provides a
var-
able dc offset
voltage
from zero (centered) to
either -- 7 .5 V (fully cew)
or

+7 .5 V (fully cw) .
When pushed in pro-
vides zero off-set, For S N
below B130000 control
does not pull out and
offset limits are - 5 V to
+5 V .
PHASE Control
When pulled out provides
continuously variable
selection of the gated
output waveform start
level (phase) from +90 0
(fully ccw) to -90 0 (fully
cw) referenced to the sine
or triangle waveform 0 0
starting point . Used in
conjunction with the
GATE INPUT connector
when operating in gated
output (burst) mode .
TRIG
OUTPUT
Connector
Bs m connector
that pre
vides a +2 .5 V square-
wave trigger output into
a
600 0 load,
OUTPUT Connector
Bnc connector that pro-
vides the output wave-
form selected by the
FUNCTION selector,
POWER Indicator
GATE INPUT Connector
A brie
connector for
applying a +2 V
to +15 V
gating signal to the
generator .
Fig . 1-3 . Operating controls and connectors .
when power is ap-
the
FG 501 .
Operating Instructions-FG 501
FREQUENCY Hz Dial
The frequency of sine,
triangle and square
waveforms is the
dial
reading times
multiplier .
Ramp arid pulse
wave-
forms have a
frequency
approximately 1 .6X
dial
setting times
multiplier
with the MULTIPLIER
at
1 or above and
a fre-
quency of approximately
2X dial setting on the
three lowest ranges of
the
MULTIPLIER selec-
tor .
Provides vernier selec-
tion of output frequency
from the fully cow
(calibrated) position to
approximately 0 .35% of
full scale in the fully ccw
position .
MULTIPLIER Selector
Selects frequency range
in 9 decade steps and
provides three "hold"
positions (between the
lowest three multiplier
positions) that hold the
generator output at any
desired
instantaneous
voltage level .
Bnc connector for apply-
ing an external voltage
for controlling
the output
frequency o f the
generator . A 10 V input
provides a frequency
range of 1000 : 1 .
1431-13A

O perating
Instructions-FG 501
into α 50 Ω attenuator
and α 50 Ω termination
at the
oscilloscope input .
The attenuator isolates
the input
capacity of the device
. Distortion can be
caused by this
input
capacity .
Α simple
resistive impedance-matching
n etwork t hat
p rovides
minimum attenuation is
illustrated in F ig . 1-4 . To
match impedance with t he
illustrated network, the follow-
i n g co n ditio ns must exist
:
and
Th
erefore :
(R, +
Ζτ ) R
τ
m
u st eq ual Ζ ,
R ,+
Ζτ
+ R z
R, +

Z,
R 2

must equal Ζτ
Z,+ R z
R
ι R z = ΖιΖ
z
;
and R ιΖι =
R
z ( Ζτ - Ζ I )
or R ι =

Ζτ
( Ζτ - Ζι )
and
R
z = Ζι -
\
Ι

Ζ 2
Ζ
_
τ
Ζ ,
F or exam p le ; to matc
hα50 Ω system to α 125
Ω system,
Ζ , eq uals 50
Ω a n d Ζ
2
eq uals 125 Ω .
Th erefore :
R,=-\/i25-(125-50) =96 .80
an dR 2 =
50

125
25
50
-
64
.6 Ω
Wh en
co n structi n g suc h α d
evice, t h e environme n t
surrounding
t h e compo nents s h ould also
b e design ed to
provide α
transition b etwee n t he im p
edan ces . K eep in
mind t h at t
h
e
c h a r acteristic im p eda n ce of
α coaxial d evice
is determined
by t he ratio b etwee n t
h e outsi de diameter of
t
h
e
in ne r conductor to t
h
e i
n si de d iameter of t he
outer
cond uctor . τ ο = 138/
ε log,o D/d, w here D is t
h
e
i n side
diameter of t h e outer
con d uctor, a n d d is
t he outside
diameter of t
he in ne r conductor . ε is
t h e dielectric co n s-
tant (1 in air) .
Attenuation R atios . Th o u g
h t he networ k i n F ig .
1-4
provi
d es mi n imum atte n
uatio n fo r αpu r ely
resistive
im pe d a n ce-matc h i n g
d evice, t h e atte nu atio nas seen
from
o ne end does
not eq ual t h at see n from
t he ot he r en d . Α
signal ( Ε ,)
ap p lied from t h e lower impeda
n ce sou r ce ( Ζ ,)
en cou n ters α
voltage atte n uation ( Αι )
w h ic h is g r eater
t han 1 an d less
t han 2, as follows :
Α , =Ez =
Ζτ
+ 1
Fig . 1-4
. I mp edance-match
i ng n etwor kth at pr ovi d es
m i n im um
attenuatio n .
Α sig n al (
Ε
2)
app lied from
t he h ig h er im ped
an ce source
( Ζ
2)
en cou
n ters α greater
voltage atten
u atio n ( Α
2)
wh ic
h
is
greater t
han 1 a nd
less t h an 2 (Z2/Z,) :
_ Ετ __
R'
+
R'

+ 1
Az =

Ε
ι

Rz

_EL
In t h e
example of matc
hing 50 Ω to
125 Ω .
Α '

925
+1=1 .77
Α 2 =
96
.8 + 96 .8
+
1 = 4 .44
64 .6
50
T
he illustrated
n etwor k can b
e mo d ified to p
rovide
different attenuatio
n ratios by
ad d i ng anot
h er resistor
(less t han R,)
betwee n Ζ , an d
t h e j un ctio n of
R, an dR z .
Duratio n of R
amps and P ulses
Th ed
uration of ramp
an d p u lse
waveforms is always
eq
ual to t he h alf-cycle
time of t h e
sine, square, or triangle
waveform freque
n cy . For MUL
TI PL I ER setti n gs of
1 or
greater, t
he retrace/off time is suc
h t h at t h e
waveform h as
αdu ty cycle
of approximately 80
ο / ο, i .e ., fre quen
cy equals
a pp roximately
1 .6 Χ FRE Q
UEN CY Hz
dial setti n g . For
MUL TI PL
I ER setti n gs less
t h an 1, t h e
retrace/off time is
from
10 ms to 100 ms,
w h ic h results
i n duty cycles
a
pproaching 100 ο/ο ;i
.e ., frequency equals
approximately
2 Χ FRE Q UEN CY Hz
d ial setting .
REV .
Β JUL
197 8

Free- R u nn
ing
O
u tput
T he
following proced u re provi d es α fr ee-run n ing
waveform outp ut
wit h variable fre q ue n cy an d amplitude .
1 . Set t h e A MPL control to t he fully co u ntercloc k wise
p osition and t he O FF S E T co n trol to t he 0 (cen
tered)
positio n . C h eck t h at t he PH AS E co
n tr
ol is
pus h ed in (off) .
2 . Set t
he
FUN
CTIO N selector to t h ed esired
waveform
(see F ig . 1-5) .
F ig . 1-5 .
O
u t p ut wavefo r ms availa b le f r om t he F G 501 .
3 . Select t he desire d fre quen cy
wit h t h e MUL TI PL I ER
selector a nd FRE Q UEN CY Hz d ial
. F
or
exam p le, if t h e
MUL TI PL I ER selecto r is set to t
he10 5 p osition an d t h e
FRE Q UEN CY Hz d ial is
at 5, out p ut fre q ue ncy is 500 kH z ;
i .e ., MUL TI PL I ER
setting Χ FRE
Q
UEN CY Hz setti ng . T h e
output fre q ue
n
cy is
calibrated w h e n t h e FRE Q UEN CY
VERN
I
ER
control is in t h e fully cloc k wise p ositio n . T h e
d uratio n of ram
p
a
n
dpulse
waveforms is depende n t on t he
MUL
TI PL I ER setti n g . See Duration of R am p s an d
P
ulses
under O p erating Co n si d eratio n s for furt h er
i n formatio n .
4 . Connect t h e loa d to t he O U T PU T connecto r and
a dj ust t he A MPL co n trol for t h e desired outp ut am p litu de .
V a r iable DC Offset
Pull outwar d on t he
O
FF
S E T
con
trol (pull switc h a dded
at S N 13020000) to positio
n t h edo level (baseli n e) of t h e
outpu
t waveform . F or exam p le, +5 V of offset will i n c r ease
t
he
do
+ p eak ac voltage of α7 .5 Vρ
- ρ
out p ut to +5 and
+12 .5 V do + p ea k ac w h ile -5 V of offset will re d uce t h e
d o + pda k ac outp ut to +2 .5 V a nd -5 V .
REV . C JUL 197 8
O PER ATIO N
Ope r ati n g I n st ru ctio n s- F G 501
Gate d ( B urst)
Output
an
d V ariable Ph ase
Α gating sig n al of 2 to 15 V amplitu d e a pp lie d to t he
GAT E I NPU T connector wit h t h e PHAS E control pu lled
out will provide α burst of cycles at t he O U T PU T
co nn ector . T he d uration of t h e burst a nd nu mber of cycles
in t h e bu r st depen d on t h e gati ng signal du r atio n an d t he
output fre q uen cy selecte d . Wh en t h e gati
ng sig n al goes to
t h e zero level, t he ge
n
erator
completes its last cycle an d
remains q uiescent
un til t h e n ext gating signal .
Si ngle cycles can b e obtained by a p plyi
ng
α
gati ng
signal
wit h α perio d approximately equal to t
he
p erio
d of
t
he F G 501 ou tput waveform . T he n um b er of
cycles pe r
b urst can be ap p roximated by d ivi d i n g
t he gating sig n al
duration by t he p eriod of t h e
F
G
501 out p ut f r eq ue ncy .
GAT
E INPU T
OUT PU T
GAT E INPU T
OUTPUT
GAT E
I NPU T
OUTPUT
PH AS
E co n tr ol
at
90 ° L AG
PH AS E co n trol at
0 °
PHAS E co n tr ol at 90 ° LE AD
1431-04
F ig . 1-6 . Si n gle
cycle ou tp u t wit h variable ph ase .

Op erating Inst r uctions- F G 501
T he ph ase (start level) of t he waveform burst can be
varied ±90° by p ulli n g out and turning t h e PH AS
E co n trol
eit h er countercloc k wise or cloc
k wise from t he 0
(centered) p osition (see F ig . 1-6) .
T he
p
hase of t he ou tput
burst is refere n ced to t h e sine or
tria n gle waveform 0° start
p oi nt .
Out p ut fre q uency canbe
varie d duri ng t he b urst
d uration by applying
αvoltage-con trolled freq
uen cy
(V C F) signal to
t he V C F I NPU T conn ector .
V oltage-Controlled
F requency (V C F) Out p ut
T he outp ut fre quen cy of any selected
waveform can be
swe p t wit h i n α range of 1000 :1 by ap
plyi ng α 0 to 10 V
signal to t he V C F I NPU
T
con
nector . T he polarity of t he
V C F input signal
determines w h ic hd irectio n t h e out p ut
VC
F+10

VC F 0
INPU T 0

INPU T
_10
OUTPUT ( ΙΙΙΙΙΙΗΙΙΙΙΙΙΙΙΙΠΠΠΠΠΠλΓΙΠΜ ~ ΙΙΠΓ 1
OUTPUT
S WEP T FRE O
UEN CY
RANG E
V C F+5
0
I NPU T
_5
OUT PU T
1431-05
fre q uency sweeps
from t h e f r e q
uency set by t he
MUL
TI PL I ER selector and FRE Q UEN CY
Hz d ial ; i .e ., α +
signal
sweeps t h e fre q uency up war
das sh own in F ig .
1-7( Α ), α - sig n al sweeps
t h e frequency downwar d as
sh own in F ig . 1-7( Β ) .
Th e
maximum swept fre quen cy range of 1000 :1 en com-
p asses t h e sensitive
uncalibrated ra n ge of t he FRE-
Q UEN CY
H z dial, i .e ., < .1 to 1 . T h erefore, to ensure t h at
t
h e frequen cy d oes sweep at least α range of 1000
:1, it
is
recomme nd ed t h at t he FRE Q UEN CY Hz dial be
set at 10
an d α Oto-10 V sig n al be a pp lie d tot
h
eV C
F IN con n ector .
T heout p ut will t h us sweep d ownward at least 1000
:1 from
α FRE Q UEN CY Hz dial setti n g of 10 as sh ow
n i n F ig .
1-7( Β ) . It may be necessary to vary t
he
CA
L control to
obtai n t h e full 1000 :1 swept ra
n
ge or
t he lowest swept
fre q uency desire d .
F ig . 1-7 . Swept Fr equen cy r
ange wit h 10 V sig n als a p plied to V C F IN conn ecto r .
REV . Β JUL
1978

An input signal that varies symmetrically about
α0 V
level will also sweep t he generator
symmetrically about
the center frequency set b y the MULTIPLIER selector an d
FREQUENCY Hz d ial as shown in F ig . 1-7(C) .
Since the V CF input amplitude vs frequency is α linear
relationship, the fre q uency output range can be
d eter-
mine d from the V CF in p ut amplitude .
H old M ode
Three detented H OLD positions are provided
between
the lowest three MULTIPLIER
selector positions . By
switching to any one of
the H OLD positions, the generator
can be stopped
at its instantaneous voltage level and h eld
there until the MULTIPLIER selector setting is changed .
T rigger
Out put
ATTL-compatible+2 .5
V
square wave
isavailable f rom
the TRIG OUTPUT
connector . The frequency of the
trigger output is
d etermined by the output frequency
selected by
the MULTIPLIER selector and FREQUENCY
Hz dial
(see F ig . 1-8) . When the FUNCTION selector is set
for ramp or pulse,
thetrigger output frequency is about
1
.6
times the
d ial indications . Output impedance is
600 Ω .
REV . Β JUL 1978
Operating Instructions-FG 501
Triangle
W
aveform
Sine W ave
Duty cycle of the TRIG OUTPUT waveform follows
the d uty cycle of the OUTPUT waveform .
TRIG OUTPUT
W aveform
Square W ave
TRIG OUTPUT
W aveform
1431-18
F ig . 1-8 . Phase r
elationships b etween various waveforms from
OUTPUT and TRIG
OUTPUT connectors .

Op e r ating Inst r uctions- F G 501
R es p onse Analysis
T he F G 501 is particularly suite
d fo r d etermi ning
response ch aracteristics of
circuits or systems . Th is
application utilizes t he
VC F i n put of t he F G 501 to swee p
t he generator over α
range of fre q uencies . Βγ ap p lyi n g t
he
desire d waveform from
anoth er F G 501 (or e q u ivale
n t) to α
device un
d er test and sweepi ng t he waveform
fre q uency
over α
selected ra n ge, various respo
nse ch aracteristics
can be
observe d on α monitoring
oscillosco pe .
T h e
following p rocedure d escri b es α
tec hn i q ue for
determining res p onse ch aracteristics
of any frequency-
sensitive device t h at operates
wit h in t he frequency range
of t h e F G
501 . R efer to t h e V oltage-Controlled
F reque ncy
(V C
F) Out p ut d iscussio n under O p eration for ad
ditio n al
informatio
n .
1 . Connect t h e equi p me n t as sh
own in F ig . 1-9 .
2 . Set t he MUL TI PL I ER
selector a nd FRE Q UEN CY Hz
dial for t h e desire
d upper or lower fre quency
limit
(depen d i ng on
t he directio n you wis h to sweep) .
A PPL ICATIO
N
S
F ig . 1-9 . A n alyzi ng ci r cuit o r system res p on se .
3 . Apply t he d
esired waveform to t h e VC
F I NPU T
connector . ( Α p
ositive-going waveform will swee p
t he
frequency upwar ds from
t he FRE Q UEN CY Hz dial setti
n g
w h ile α negative-going
waveform will swee p d ow
n wards .
4 .
Ad j ust t he am p litude
of t h eV C F input
waveform for
t he d esired out p ut fre q
uency range .
5 . Observe t h e res p o
nse ch aracteristics on
t he
mo n itoring oscilloscope
.
T h e fre q uency at w h ic h α dis played
r espo nse
ch
aracteristic occurs can be d
etermine d by first removing
t h eV
C F in p ut waveform,
t hen manually ad j usting t
he
FRE
Q
UEN CY Hz dial to
again o b tain t h e p articular
c h aracteristic observe
d in t he swept dis p lay and
readi n g
t h at fre q uency on
t he FRE Q UEN CY H z d ial .
REV . Β JUL
1978

Tone- B urst Generatio n or Steppe d F re q ue n cy
M ulti p lication
The F G 501 can be use d as α to n e-burst generator or
fre
q uency multi p
lier
for c
heck i ng
to
n e-controlle d
devices .
T h
is
ap p licatio n utilizes α ramp ge n erator, suc h
as t h e T EK T R O N IX R G 501, as α VC F signal source a nd α
p ulse generator, suc h as t h e T EK T R ON IX P G 501, as α
gating signal source .
T h e following proce dure describes α tech ni que for
obtaini ng α tone-burst or fre q uency multiplied output
from
t h e F G 501 . R efer to t h e Gate d ( B urst) Output an d
V
ariable Ph ase a nd t he V oltage-Co n trolled- F re qu ency
(V C F) Out p ut discussions un d er O p eratio n for ad ditional
information .
1 . Connect t he
equipment as s h ow n in F ig . 1-10 .
REV Α , JUN 197 8
F ig . 1-10 . To n e- bu rst ge ne r atio n o r ste pped f r equen cy m u lti p licatio n .
O p erating Inst ru ctions- F G 501
2 . Pull out t h e F G 501 PH AS E control . Set t h e ram p
generator for t he d esire d ramp d uratio n an d polarity
.
3 . Ad j ust t h e pulse generator perio
d
for
t he d esire d
n umber of bursts wit h in t h e selecte
d ram p d uration .
Ad j ust t he pulse generator
d uration for t he d esire d burst
widt h .
4 . Select t h e swee p fre quency ra n ge b y ad j usti ng t he
FRE
Q
UEN CY
Hz
dial for one en d of t he swe p t range
(upper or lower limit de pen di n g on t he p olarity of t he
ram p ) . T he n, ad j ust t he ram p generato r am p litu d e fo r t he
ot h er swe p t fre q uency limit .
V arious ot h e r to n e-burst or frequency
multi p lied
ch
aracteristics can be obtained by usi ng d iffere n t gati n g
input waveforms, i .e ., t r ia n gle, si n e, s q uare, etc .
V
C
F I NPUT*
GAT E I
NPUT*
To n e- Bu rst o
r
Ste pp ed F re qu
en cy
O
u tp ut
*Gating pulse sync h ro n ize d
wit h V
CF R
A MP .
ν ι
1141' ίάϋυυ
1431-07

P
erformance Conditions
S PE CI
F ICATIO N
A N
D PERF O RM A N C
E
C
HE C K
Th e
electrical c h aracteristics are vali d only if t h e
F G 501 has b ee n
calibrate d at
an
ambie n t temperatu r e
b etween +20 0 C a nd +30 0 C
an d is operati n g at an ambie n t
temperature
b etwee n 0°C an d +50°C unless ot herwise
noted .
F orced ai r circulatio n is re qu ire d for am b
ie n t
temperatu r e a b ove +40°C .
REV . Β JUL 197 8
S
PE CI F ICATIO
N
Ta b le 2-1
ELE CT R ICA L C H AR ACT ER
ISTICS
Sectio n 2- F G 501
Only t h ose items liste d in
t he P erformance R e-
quireme n ts col u m n of t h e E
lectrical Characteristics table
are normally verifie d w he n d oing t
h
e
P erfo r ma nce C heck
proce d ure of t h is man u al . Items
listed in t h eS u p p lemental
Informatio n col u m n are
eit h er ex p lanatory notes or
mi nim u m p
erforma n ce ch aracte r istics for
w h ic h
no
tolera n ce ra n ges are sp ecified, a
n
d
w h ic h normally r e-
q uire verification only afte r re p airs
o r p arts re p laceme n t .
C ha
r
acte
r istic P erfo r ma n ce
R equireme n t S up pleme
n tal I n fo r matio n
F reque n cy
R
a n ge
Si
ne W ave, S qu are W ave, 0 .01 Hz to
1
MHz
in 9 d ec ad e ste p s .
an d Triangle
Acc ur acy
W it h in 3 ο / ο of full scale 1 to 10 ;
.1 to 1 un cali b rated .
R esolution
1 part i n 10 ° of full scale wit h
FRE
Q
UEN CY VERN I ER co n t r ol
.
Stability
Temperature
W it h i n 2 ο/ο from 0 .1 Hz to 1 MHz,
a nd wit h i n 10 ο/οf r om
0 .001 H z to
0 .1 H z, 0° C to
+50° C .
Time
W
it h i n 0 .1 ο/ο for 10 mi nu tes .
W it h i n 0 .25% for 24 h ours .
P ulse an dR amp ra n ge
-2 Χ dial setting wit h MUL
TI-
PL I ER at 10 - ' to =1 .6 Χ dial set-
ti n g wit h MUL TI PL I ER AT
10 5
setting .
Time Symmetry
Sine W ave, S q ua r e W ave,
W it h i n 1ο/ο from 0 .001 Hz to
1
MHz
W it h i n 10 ο/ο on
uncali b rate d po r-
and T r ia ngle on
calib r ate d po r tio n (1 to
10) tion (0 .1
to 1) of FRE Q UEN CY H z
of FRE Q UEN CY Hz
dial, +20°C to d ial .
+50° C .

Specificatio na n d P erfo r mance C
heck - F G 501
Ta b le 2-1 (co n t)
2-2
REV
C, M AR 197 9
C h aracte r istic
P erfo r mance R e qu i r eme n t
S u ppleme n tal I n fo r mation
Amplitu d e (excl u ding
offset) S N B130000-up : 20 Vρ - ρ o pen
P ower-s upp ly limiting causes com-
circ u it . 10 Vρ
- ρ
into 50 Ω loa d .
p ressio n of o u tp u t wavefo r m
Sine, tria n gle, an d s q ua r e wave
w hen maximum amplitude an d max-
amplitudes matc he d wit h i n 5 ο /ο for
imum offset are used simulta-
si n glesetti n gofA
MPL IT
UD
E co n - n eously .
trol
.
B elow S
N Β 130000, O U T PU T
co
n trol p rovi des 15 V ρ - ρ o pen
circ u it a nd 7 .5 V ρ - ρ i n to
50 Ω loa d .
Stability
W it h i n 2 ο / ο from 0 .1
Hzto 1 MH z .
Tem p
erature
W ti h in 10 ο/ο from 0
.001 Hz to
0 .1 Hz, 0° C to +50 0 C .
Time
W it h i
n0
.1
ο/ο fo r 10 mi n utes .
W it h i n 0 .25% for 24 h ours .
H ol d M ode Stability
W it h i n 5
ο/ο
of f u ll out
p ut voltage i n
1
h ou r at
+25°C on 0
.001 Hz ra n ge .
Offset
Amplitu d e
I
n to
O
p en
Circuit S N B130000-up :
+
or
- 7 .5 V
S N below
Β 130000 : + or - 5 V
Into 50 o h m L oa d SN B130000-up :
+ o r - 5 V
S
N below - Β 130000 : + or - 2 .5 V
R ange
Into O pe n Circ
u it At least + an d - 15 V pea
k sig n al
plus offset
.
Into 50 o h m L oad
S N B130000-up : At least + and
-6 V pea k signal p lus offset .
S N b elow Β 130000 : At least
+
an d - 5 V pea k sig n al
p
lus
offset .
Output Impedance
50
Ω .
Trigger Out p u
t
Amplitu de
+2 .5 V square wave i nto α
600 Ω loa d .
F reque ncy
Same as fre q ue ncy at ou t pu t con-
nector .
Triangle a nd R am p
W it h in
1 ο/ο from 0 .001 Hz to
L inearity ( b etween
100
kH z exclu d i n g fi r st 200 n s
10% and90 ο / ο p oi n ts)
after switch poi n ts .
W it h in 2 ο/ο from 100 kH z to
1
MHz,
excl ud i ng fi r st 200 ns after
switch poi n ts .

Table
2-1 (con t)
Specificatio n and P erformance C
heck - F G 501
REV C, M A R 1979
2-3
C h aracteristics
P erformance Req ui r
eme n t Suppleme n tal
I n formation
R am pDuration
=
1 (see O p
erati ng Consider-
2f ations)
.
Si
ne W ave Distortio n 1 ο/ο or less
from 0 .001 Hz to 1 H
z . A p plies to cali b rate
d p ortion of
0 .5 ο /ο
or less fr om 1 H z to 20 kH
z . dial only
(1 to 10) . V alid from
1ο/ο or less from 20 kH
z to 100 kH z .
+10°C to +50°C .
2 .5% ο or less from
100 kH z to 1 MH z
at 10 5 MUL
TI PL I ER setting .
Square
W ave and P ulse
Out p uts
R isetime
100 ns or less .
10% to 90% .
Aberrations
5% ο or less measured
ρ - ρ wit h out-
put am
p litu de at 10 V i n to exter-
nal 50
Ω load .
P ulse
Duration
= 1
(see O p erati n g Consi d er-
2f atio n s) .
E xter n al Gate I np ut
Input Signal
S quare wave at least
+2 V, b ut
n ot to exceed
+15 V . Output bursts
are sy
n
ch
ronize d wit h gate in p ut .
B urst L ength
Determined b y selected output
frequen cy and gating pulse wi d t h
.
Ph asing
Co
n ti nuously variable from -90@
to +90° referred to 0° si ne or
triangle start p oints .
Input Impe d ance
-=1 k Ω
.
E xternal V oltage-
Controlle d F re q uency
(V C F) Input
Output
F re q uency At
least 1000 :1 wit h 10 V V C F
R an ge
input . N egative-goi
n g
voltage
decreases fre q ue ncy ; p
ositive-
going i n creases
fre
q
uency .
f_ Χ
= 10 Χ MUL
TI PL I ER setting,
fm in
MUL
TI PL I ER setting
100
Slew
R ate
-0 .5 V / μ s .

S p ec i f i catio n a n d P erformance C h ec k - F G 501
Ta b le 2-2
ENV I R O N M EN TA L C H A R ACT ER
ISTICS
Ta
b le 2-3
PH YSICA L C H A R ACTER ISTICS
C ha r acte r istics
I n fo r matio n
Tem p erat u re
Operati n g 0°
C
to
50° C .
Storage
-40° C to +75° C .
Altitu de
Operating To 15,000
feet . M aximum o p erating temperature d ec
r ease d b y
1°C/100
feet f r om 5000 to 15,000 feet .
Storage To
50,000 feet .
V ibration
Operati ng a n d non-operating W it h t
h
e
inst r ume n t complete, vibratio n freq uen cy
swe p t f r om
10 to 55 to 10 H z at 1 mi n ute per swee p .
V ibrate 15 mi nu tes in
eac h of t he t h ree ma j o r axes at 0 .015"
total d is p lacement . H ol d
10 minutes at any ma j or reso n an ce ; o
r , if n one, at 55 H z . Total
time, 75 mi n utes .
Shoc k
Ope r ating a
nd
non-operating
30 g, 1/2 si n e, 11 ms
d u ratio n , 3 s hocks i neac h directio
n
along 3 major axes,
for α total of 18 s h ock s .
T r a n s p ortatio n
Qualifie dun der N atio n al Safe Tra n sit Committee
Test Pr oce d ure
1 Α ,
Category ΙΙ .
C h a r acte
r
istic Dime n sion
Ove r all Size
(meas u re d at maximum
p oi
n
ts)
H
eig h t 5 .0 i n (12 .7 cm)
W i d t h2 .6 i n (6 .6 cm)
Len gt h 12 .2 i n (31 cm)
N et W eig h t 2 Ibs (0.906 k g)
(i n stru m ent only)

Introduction
Th is p rocedure ch ec ks t he electrical
c h aracteristics of
t he F G 501 t h at ap p ear in
t he Specification sectio n of t h is
manual . T h is
proce d ure can also b e use d by an i n comi
ng
ins p ection
facility to determine acceptability of
p erfor-
ma nce . If t he i n strume n t fails to meet t h e re q
uireme n ts
give n i n t h is performance chec
k , t h e ad j ustme n t
proced u re should b e p erforme d .
T he electrical ch aracteristics
i n Table 2-1 are valid only
if t he F G 501 is cali b rated at an
ambie n t tem p erature of
+20°C to +30 0 C and
operated at an ambie n t tem p erature
of 0°C to
+50°C . F orced air circulation is re q
uire d for
ambient temperatu r e ab ove +40°C .
'Requires TM 500-Series power
mo d ule .
PERF O RM A
N
C
E CHE C K
Ta b le 2-4
L IST O FT E ST
E
QU
I PMEN T RE Q U I REMEN TS
Specificatio n a nd P erforma n ce C h eck
- F G 501
Tolerances t h at are specified in t h is p
erforma n ce
ch ec k p roce d ure a pp ly to t h e i n strume
n t un de r test a nd do
n ot i n clude test eq ui p me n t error .
Test E q ui p ment
R
e q
uire d
T he test e q uipment listed i n Ta b le 2-4, or e q
uivalent, is
req u ire d to perform t h e performa nce chec k . Test e
qu ip-
me n t c h aracteristics listed are t he mi n imum re q
uire d to
verify t h e p erformance of t he eq uipme
n
t u
nd er test .
Substitute e q ui p me n t must meet o
r exceed t he state d
requireme n ts . All
test e q ui p ment is assumed to b e
operati ng wit h in tolera nce .
P erforma n ce
Description
R e q ui r ement Applicatio
n E xample
Oscilloscope
Ba ndwidt h do to 15 MHz ; Steps
1, 2, 3, 5, 7, 8, T EK T R O N
IX Τ 921 or eq uiv-
deflectio n factor 10 m V / and 9 .
ale n t .
div to 5 V /div ; sweep
rate 20 n s/div to 1 ms/
d iv .
P
ower M odule T hree com p artments or
All tests .
T EK TR O N IX TM 503,
more
.
TM 504, or equivalent .
Digital V oltmeter
R
ange 0
to ±20 V d c ; d is- V C
F
I
NPU T and Offset T EK TR O N
IX D M 501 8 .
p layed error less t han ra
n
ge
c heck s .
0 .5 ο / ο .
F
reque n cy Counter F requency range
0 .1 Hz B asic timi ng & V C F
T EK T RON IX DC 504 8
to above
1 MH z ; accu r acy I NPU T .
or e q u ivalent .
wit h i n on e p a r t of 10 5
±1 count .
P ulse Generator
0 to +2 V sq uare-wave
Ph ase ra n ge c heck .
T EK T R ON IX P G 501 8
output into 50
Ω loa d . or
e q uivalent .
P erio d 0 .2 ms ;
duration
0 .1 ms .
V ariable do
Out p ut 0 to 20 V at 0 .4 Α C
heck V
C
F I NPU T . T EK T R O N IX PS 501
8
P ower Sup p ly
o r greater .
or eq uivalent .

Sp ecificatio
na nd P erformance
C
h ec k - F
G
501
1 . E nsure t h at t he correct n ominal line selector bloc
k
h as been installed on t h e line selector
p i ns
on
t he p ower
module i n terface boar d , a
nd
t h e regu
lating rangeselecte d
incl udes t he ap p lied li n e voltage . R efer to
t h
e
i n stallatio n
sectio n of t he power mod u le ma
n ual .
2 .

E nsure t h at all test eq uipment is suitably adapted
to
t he a pp lied li ne voltage .
3 . I n stall t h e F G 501 into t he p
ower
mo
d ule an d, if
ap p licable, i n stall t h e TM 500-Series test e quipme
n t i n to
t he test e q uipme n t p owe
r
mo d ule .
4 . Co n nect t he eq uipment u nd er
test an d t he test
eq uipme n t to α suita b le
li nevoltage source . Tur n on all
e qu i p ment and allow
at least 20 mi nu tes for t he e q uipme n t
to stabilize .
' B elow S NΒ 330000 A MPL con t r ol is la b ele
d
O UT
PU T .
'For S N b elow Β 130000 set O FF S E T to ze r o .
2- 6
PREL I M I N A R Y PR OC E
D URE
Ta b le 2-4 (co n t)
PERF O RM A N C
E
C
HE
C
K PR OC E D URE
1 . Dial Alig n ment
α . Set t he F G 501
controls
as
follows :
FUN CTIO N Tria n gle
A MPL'

F ully cw
O FF SE
T'

M idrange an d
In
PH AS E

In
MUL
TI PL I
ER
10'
FRE Q VERN I ER

F ully εω
FRE Q UEN CY Hz

Nea r 10
b . A d j ust t he oscillosco p e vertical for do coupli
ng at
2 V /div sen sitivity . Set t h e time base swee p
spee d to
.1 ms/ d
iv .
Set
t he triggering
co
n trols to i n ter n al source +
slope o p eratio n .
c . Co nn ect t he OU T PU T of t he F G 501 t h roug hα 50
Ω
coaxial ca b le and α 50
Ω
termination, wit
h t he 50 Ω
termi n ation at t he vertical
i
np ut of
t h e oscilloscope .
REV Α ,
M AR
1979
P e rfo r ma n ce
Descriptio n Requ
ir ement Ap p licatio n E xam p le
Distortion F re q uency range
from 1 Hz C h eck sine wave d is- H ewlett-
P ac k ar d 334 Α Dis-
A n alyzer to at least 600
kH z . Dis- tortio n . tortion
Analyzer or eq uiv-
tortion
resolution
<0 .5% .
alent .
50
Ω F
eedt
hr oug hbnc connectors . Steps 1, 2, 3, 5, 6, 8,
Te k tronix P art No .
Termination (2)
a n d 9 . 011-0049-01 .
600
Ω
Feed t
hr
oug
hbnc co nnectors . T R IG O U T PU
T Am p lit ud e Te k tro n ix P art No .
Termination
c h eck
011-0092-00 .
50
Ω Coaxial Cables bnc con n ectors . All .
Te k tronix P art No .
(2 ea)
012-0057-01 .
Adapter b sm-to-bnc .
T R IG O U T PU T Am p litu d e Te k tronix
P art No .
c heck .
103-0036-00 .
Ada p
ter D u al banana plug-to- b nc V C F I NPU T check .
Te k tronix P art No .
female .
103-0090-00 .
Tee Co nn ector b nc connectors . B asic timi
n g check . Te k tro n ix P art No .
103-0030-00 .
10
Χ Attenuator b nc connectors S quare wave ch ec
k
s .
Te k tronix Part No .
50 Ω impe d a nce .
011-0059-02 .